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 程式師世界 >> 編程語言 >> 更多編程語言 >> Delphi >> 再學GDI+[47]: 路徑 - CloseFigure

再學GDI+[47]: 路徑 - CloseFigure

編輯:Delphi

本例效果圖:

代碼文件:unit Unit1;
interface
uses
 Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
 Dialogs, StdCtrls;
type
 TForm1 = class(TForm)
  CheckBox1: TCheckBox;
  CheckBox2: TCheckBox;
  procedure FormCreate(Sender: TObject);
  procedure FormPaint(Sender: TObject);
  procedure CheckBox1Click(Sender: TObject);
  procedure CheckBox2Click(Sender: TObject);
 end;
var
 Form1: TForm1;
implementation
{$R *.dfm}
uses GDIPOBJ, GDIPAPI;
procedure TForm1.FormCreate(Sender: TObject);
begin
 CheckBox1.Caption := '閉合路徑';
 CheckBox2.Caption := '填充路徑';
end;
procedure TForm1.FormPaint(Sender: TObject);
var
 g: TGPGraphics;
 path: TGPGraphicsPath;
 p: TGPPen;
 b: TGPBrush;
 pt1,pt2,pt3: TGPPoint;
begin
 pt1 := MakePoint(0, ClientHeight div 2);
 pt2 := MakePoint(ClientWidth div 2, 0);
 pt3 := MakePoint(ClientWidth, ClientHeight div 2);
 g := TGPGraphics.Create(Canvas.Handle);
 path := TGPGraphicsPath.Create;
 path.AddLine(pt1, pt2);
 path.AddLine(pt2, pt3);
 if CheckBox1.Checked then path.CloseFigure;
 p := TGPPen.Create(aclRed, 2);
 b := TGPSolidBrush.Create(aclYellow);
 if CheckBox2.Checked then g.FillPath(b, path);
 g.DrawPath(p, path);
 b.Free;
 p.Free;
 path.Free;
 g.Free;
end;
procedure TForm1.CheckBox1Click(Sender: TObject);
begin
 Repaint;
end;
procedure TForm1.CheckBox2Click(Sender: TObject);
begin
 Repaint;
end;
end.

窗體文件:object Form1: TForm1
 Left = 0
 Top = 0
 Caption = 'Form1'
 ClientHeight = 179
 ClientWidth = 243
 Color = clBtnFace
 Font.Charset = DEFAULT_CHARSET
 Font.Color = clWindowText
 Font.Height = -11
 Font.Name = 'Tahoma'
 Font.Style = []
 OldCreateOrder = False
 Position = poDesktopCenter
 OnCreate = FormCreate
 OnPaint = FormPaint
 PixelsPerInch = 96
 TextHeight = 13
 object CheckBox1: TCheckBox
  Left = 44
  Top = 145
  Width = 97
  Height = 17
  Caption = 'CheckBox1'
  TabOrder = 0
  OnClick = CheckBox1Click
 end
 object CheckBox2: TCheckBox
  Left = 132
  Top = 145
  Width = 97
  Height = 17
  Caption = 'CheckBox2'
  TabOrder = 1
  OnClick = CheckBox2Click
 end
end

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